利用不同空间频率的组合光栅实现任意进制的光逻辑计算和光学加密  

Optical multinary logic operations and optical encryption achieved with gratings of different spatial frequency

作　　者：荣俊臣[1] 周辉[1] 潘永华[1] 高惠滨[1] 

机构地区：[1]南京大学物理系,江苏南京210093

出　　处：《物理实验》2010年第8期9-15,共7页Physics Experimentation

基　　金：2009年国家大学生创新性实验计划(No.091028452)

摘　　要：利用阿贝成像和θ调制原理实现了任意进制光逻辑计算以及彩色与灰度图像加密.在8f系统中,前后2次输入采用空间频率和取向不同的光栅组合时,滤波面上的图像将呈现高度的几何对称性,即所谓"大圆套小圆"的模型,进行2次空间滤波后,可以调控像屏上的图像输出,实现任意进制的逻辑计算,并可进一步应用于彩色或灰度图像的加密.利用电寻址液晶光阀系统进行实验,结合Mathematica软件的计算机模拟,证明了该方案的可行性.A method about the realization of optical multinary logic operations and encryptions of colorized and gray-scale pictures based on Abbe imaging principle and θ modulation is put forward. High geometry symmetry called the ＂big circle embedded by small circles model＂ is presented on the filtering plane if gratings of different spatial frequency on the two input plane in the 8f system are put together. After twice spatial filtering, the Output on the imaging plane can be controlled, optical multinary logic operations are fulfilled, and the method can be applicable to encryptions of colorized and gray-scale image. The feasibility is proved by doing experiment on liquid crystal light valve and computer simulation with Mahtematica.

关 键 词：任意进制光逻辑计算 彩色图像加密 灰度图像加密 液晶光阀 计算机模拟 

分 类 号：O438.2[机械工程—光学工程]